mirrors/cpython
1
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2025-08-04 00:48:58 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 8

gh-105938: Emit a SyntaxWarning for escaped braces in an f-string (#105939)

Browse source
This commit is contained in:
Lysandros Nikolaou 2023-06-20 14:38:46 +02:00 • committed by GitHub
parent 155577de1b
commit 6586cee27f
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
3 changed files with 18 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

11
Lib/test/test_fstring.py
View file

@ -13,6 +13,7 @@ import re
import types
import decimal
import unittest
import warnings
from test import support
from test.support.os_helper import temp_cwd
from test.support.script_helper import assert_python_failure, assert_python_ok
@ -904,7 +905,7 @@ x = (
self.assertEqual(f'2\x203', '2 3')
self.assertEqual(f'\x203', ' 3')
with self.assertWarns(DeprecationWarning): # invalid escape sequence
with self.assertWarns(SyntaxWarning): # invalid escape sequence
value = eval(r"f'\{6*7}'")
self.assertEqual(value, '\\42')
with self.assertWarns(SyntaxWarning): # invalid escape sequence
@ -1037,7 +1038,7 @@ x = (
]
for case, expected_result in deprecated_cases:
with self.subTest(case=case, expected_result=expected_result):
with self.assertWarns(DeprecationWarning):
with self.assertWarns(SyntaxWarning):
result = eval(case)
self.assertEqual(result, expected_result)
self.assertEqual(fr'\{{\}}', '\\{\\}')
@ -1046,6 +1047,12 @@ x = (
self.assertEqual(fr'\}}{1+1}', '\\}2')
self.assertEqual(fr'{1+1}\}}', '2\\}')
def test_fstring_backslash_before_double_bracket_warns_once(self):
with warnings.catch_warnings(record=True) as w:
eval(r"f'\{{'")
self.assertEqual(len(w), 1)
self.assertEqual(w[0].category, SyntaxWarning)
def test_fstring_backslash_prefix_raw(self):
self.assertEqual(f'\\', '\\')
self.assertEqual(f'\\\\', '\\\\')